Loans and Allowance for Credit Losses Average Impaired Loans by Class Segment (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	$ 64,769		$ 92,444
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	182	[1]	272	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	136,861		174,008
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	520	[1]	667	[1]
Impaired Financing Receivable, Average Recorded Investment	201,630		266,452
Impaired Financing Receivable, Interest Income, Accrual Method	702	[1]	939	[1]
Real-estate commercial mortage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	23,993		32,140
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	86	[1]	160	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	37,119		54,464
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	132	[1]	221	[1]
Commercial - Secured [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	21,125		31,413
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	35	[1]	34	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	23,045		35,864
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	38	[1]	43	[1]
Commercial - unsecured [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	0		66
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0	[1]	0	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	845		1,743
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	1	[1]	2	[1]
Real-estate - home equity [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	300		205
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0	[1]	1	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	14,096		13,301
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	20	[1]	16	[1]
Real-estate - residential mortgage [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	159		991
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	1	[1]	12	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	51,231		53,797
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	294	[1]	339	[1]
Construction - Commercial Residential [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	17,223		22,650
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	60	[1]	63	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	9,771		11,496
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	35	[1]	42	[1]
Construction - Commercial [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with No Related Allowance, Average Recorded Investment	1,969		4,979
Impaired Financing Receivable, with No Related Allowance, Interest Income, Accrual Method	0	[1]	2	[1]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	193		2,758
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	[1]	3	[1]
Construction other [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	546		533
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	[1]	1	[1]
Consumer - direct [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	13		24
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	[1]	0	[1]
Consumer - Indirect [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	2		0
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	0	[1]	0	[1]
Leasing and other and overdrafts [Member]
Financing Receivable, Impaired [Line Items]
Impaired Financing Receivable, with Related Allowance, Average Recorded Investment	0		28
Impaired Financing Receivable, with Related Allowance, Interest Income, Accrual Method	$ 0	[1]	$ 0	[1]

[1] All impaired loans, excluding accruing TDRs, were non-accrual loans. Interest income recognized for the three months ended March 31, 2014 and 2013 represents amounts earned on accruing TDRs.